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Liothyronine
Pronounced lye-oh-THY-ro-neen
Brand names: Cytomel
Type: Thyroid hormone (T3) · All Hormone & Endocrine Medicines
What Liothyronine is used for
- Underactive thyroid (hypothyroidism), usually combined with levothyroxine
- Certain thyroid tests and cancers
Common side effects
- Rapid heartbeat
- Anxiety or shakiness
- Headache
- Heat intolerance
Important cautions
- Too much causes symptoms of an overactive thyroid and can strain the heart
- It acts quickly and wears off faster than levothyroxine, so blood levels swing more
How it comes
Tablets. This guide lists forms only — it never lists strengths or doses.
Related medicines — Hormone & Endocrine Medicines
Please note: This page is a patient-education summary, not medical advice, and it deliberately contains no doses. Medicines affect everyone differently — always follow your own prescription and talk to your doctor or pharmacist before starting, stopping or changing any medicine.